Part A
ADS7844E/2K5
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 3096 PCS
- Package
- SSOP-20
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7844E/2K5 and ADS7844NBG4 are functionally equivalent 12-bit 8-channel serial ADC devices sharing the same core architecture, resolution, channel count, and interface, making them a viable functional replacement candidate. The primary distinction lies in package and ordering format, so design verification against the target board footprint and sourcing requirements is recommended before substitution.
Resolution and Channel Count
High match
Interface Type
High match
Package Type
Validation required
Ordering Format
Validation required
Parts at a glance
Part B
ADS7844NBG4
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 2245 PCS
- Package
- SSOP-20
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS7844E/2K5 | ADS7844NBG4 | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 12 bit | Determines the quantization step and achievable measurement precision; identical resolution means equivalent measurement granularity. |
| Number of Input Channels | 8 single-ended / 4 differential | 8 single-ended / 4 differential | Defines how many analog signals can be multiplexed into the ADC; matching channel count supports the same sensor topology. |
| Sampling Rate | 200 kSPS | 200 kSPS | Sets the maximum conversion throughput; identical rate ensures the same signal bandwidth and timing budget. |
| Supply Voltage Range | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Determines compatibility with the system power rail; matching range allows drop-in use in the same supply design. |
| Interface Type | SPI (serial) | SPI (serial) | Defines the digital communication protocol with the host; identical interface ensures firmware and pin-level compatibility. |
| Package / Mounting | 20-pin SSOP (surface mount) | 20-pin SSOP (surface mount) | Affects PCB footprint and assembly; matching package allows the same board layout without redesign. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C (industrial grade) | Determines environmental robustness; both cover the industrial range, so thermal suitability is equivalent. |
| Packaging / Ordering Suffix | Tape and reel (2K5 = 2500 units) | Tube / bulk (NBG4 ordering variant) | Affects manufacturing handling and inventory; different packaging means different reflow/feed setup despite identical silicon. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7844E/2K5 | ADS7844NBG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 200k | 200k |
| Number of Inputs | 4, 8 | 4, 8 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-S/H-ADC | MUX-S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 2.7V ~ 3.6V, 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADS7844E/2K5 and the ADS7844NBG4?
Both devices are 12-bit, 8-channel, serial-output successive-approximation analog-to-digital converters from Texas Instruments with the same core conversion architecture and 200 kSPS throughput. The primary differences are package and ordering format: the ADS7844E/2K5 is supplied in a 20-pin SSOP (DBQ) package and is provided on a 2,500-unit tape-and-reel, while the ADS7844NBG4 is supplied in a 20-pin PDIP (N) package in tube form. The "G4" suffix denotes Pb-free (RoHS-compliant) construction per TI's green-material designation.
Are the ADS7844E/2K5 and ADS7844NBG4 functionally interchangeable in an existing design?
Electrically and functionally they share the same converter core, channel configuration, serial interface, and reference requirements, so the signal-chain behavior is equivalent. However, they are not drop-in replacements for each other because the SSOP and PDIP packages have different footprints, lead pitches, and PCB land patterns. A board designed for one package cannot accept the other without layout changes.
What are the package and mounting differences between the two parts?
The ADS7844E/2K5 uses the 20-pin SSOP (DBQ) package, a surface-mount package with 0.65 mm lead pitch. The ADS7844NBG4 uses the 20-pin PDIP (N) package, a through-hole package with 2.54 mm pin pitch. The PDIP version is suited to breadboarding, prototyping, and socketed applications, while the SSOP version is intended for space-constrained surface-mount production boards.
Do both parts share the same resolution, channel count, and sampling rate?
Yes. Both the ADS7844E/2K5 and ADS7844NBG4 are 12-bit successive-approximation ADCs with 8 single-ended or 4 pseudo-differential input channels and a maximum throughput of 200 kSPS. They use the same serial SPI/QSPI-compatible interface and the same unipolar supply range of 2.7 V to 5.25 V, so conversion performance specifications are common to both orderables.
What does the "G4" suffix on the ADS7844NBG4 indicate?
The G4 suffix is Texas Instruments' designation for Pb-free (lead-free), RoHS-compliant package construction using green molding compound. The ADS7844E/2K5 is also supplied as a Pb-free/RoHS-compliant device; the "2K5" suffix specifically denotes tape-and-reel packing quantity of 2,500 units rather than a material difference.
Which part should be selected for a new surface-mount production design?
For automated surface-mount assembly, the ADS7844E/2K5 in the 20-pin SSOP package is the appropriate choice, as it is compatible with reflow soldering and tape-and-reel pick-and-place equipment. The ADS7844NBG4 PDIP package is better suited to through-hole prototyping, evaluation, or socketed legacy boards rather than high-volume SMT production.
Are the reference input and analog supply requirements the same for both orderables?
Yes. Both devices operate from a single unipolar supply of 2.7 V to 5.25 V and use an external reference voltage applied to the VREF pin to set the full-scale input range. Because the converter core is identical across the two package options, the reference drive, input range, and power-supply decoupling requirements documented in the ADS7844 datasheet apply equally to the ADS7844E/2K5 and ADS7844NBG4.
Can the ADS7844NBG4 be used as a substitute when the ADS7844E/2K5 is out of stock?
Only if the PCB provides a compatible through-hole footprint or an adapter, since the PDIP package cannot be soldered directly to an SSOP land pattern. The electrical function is equivalent, but substituting requires verifying package fit, lead forming, and any thermal or mechanical constraints. TI recommends confirming against the official ADS7844 datasheet before any cross-package substitution.